So I started the pill today and this guy I know wants to hook up in two weeks. My b.c. says that to use another method of protection if I have sex before seven days, so does that mean it's only going to take a week before they become effective? My mom said it takes a month to get in your system so I'm not sure. If I have sex after the week is up and the condom breaks or slips off I should be good though right?